It may not be completely "normal" but if they aren't causing any harm they should just be kept close watch on. There are many threads on here about trimming & removing spurs that you might want to check out.

I think of spurs that grow in odd directions like cows horns that grow into their eyes. It is essentially "normal" for them but b/c their genetics caused them to grow that way; that doesn't mean you can just leave them be. Eventually they will cause damage so its good to be prepared.